diff --git a/cmd/sshpiperd/internal/plugin/grpc.go b/cmd/sshpiperd/internal/plugin/grpc.go
index b34083f6..f51aabc0 100644
--- a/cmd/sshpiperd/internal/plugin/grpc.go
+++ b/cmd/sshpiperd/internal/plugin/grpc.go
@@ -332,6 +332,24 @@ func (g *GrpcPlugin) createUpstream(conn ssh.ConnMetadata, challengeCtx ssh.Chal
 		if err != nil {
 			return nil, err
 		}
+
+		if caPublicKeyByte := a.GetCaPublicKey(); caPublicKeyByte != nil {
+			caPublicKey, _, _, _, err := ssh.ParseAuthorizedKey(caPublicKeyByte)
+			if err != nil {
+				return nil, err
+			}
+
+			caCertificate, ok := caPublicKey.(*ssh.Certificate)
+			if !ok {
+				return nil, fmt.Errorf("Failed to convert the caPublicKey to an ssh.Certificate")
+			}
+
+			private, err = ssh.NewCertSigner(caCertificate, private)
+			if err != nil {
+				return nil, err
+			}
+		}
+
 		config.Auth = append(config.Auth, ssh.PublicKeys(private))
 		auth = append(auth, "privatekey")
 	}
diff --git a/e2e/ca_test.go b/e2e/ca_test.go
new file mode 100644
index 00000000..af44e0dc
--- /dev/null
+++ b/e2e/ca_test.go
@@ -0,0 +1,60 @@
+package e2e_test
+
+import (
+	"fmt"
+	"testing"
+	"time"
+
+	"github.com/google/uuid"
+)
+
+func TestCa(t *testing.T) {
+
+	piperaddr, piperport := nextAvailablePiperAddress()
+
+	piper, _, _, err := runCmd("/sshpiperd/sshpiperd",
+		"-p",
+		piperport,
+		"/sshpiperd/plugins/testcaplugin",
+		"--target",
+		"host-capublickey:2222",
+	)
+
+	if err != nil {
+		t.Errorf("failed to run sshpiperd: %v", err)
+	}
+
+	defer killCmd(piper)
+
+	waitForEndpointReady(piperaddr)
+
+	randtext := uuid.New().String()
+	targetfie := uuid.New().String()
+
+	c, stdin, stdout, err := runCmd(
+		"ssh",
+		"-v",
+		"-o",
+		"StrictHostKeyChecking=no",
+		"-o",
+		"UserKnownHostsFile=/dev/null",
+		"-p",
+		piperport,
+		"-l",
+		"client_123",
+		"127.0.0.1",
+		fmt.Sprintf(`sh -c "echo -n %v > /shared/%v"`, randtext, targetfie),
+	)
+
+	if err != nil {
+		t.Errorf("failed to ssh to piper-fixed, %v", err)
+	}
+
+	defer killCmd(c)
+
+	enterPassword(stdin, stdout, "pass")
+
+	time.Sleep(time.Second) // wait for file flush
+
+	checkSharedFileContent(t, targetfie, randtext)
+}
diff --git a/e2e/cahost/Dockerfile b/e2e/cahost/Dockerfile
new file mode 100644
index 00000000..f98ef801
--- /dev/null
+++ b/e2e/cahost/Dockerfile
@@ -0,0 +1,19 @@
+FROM debian:bookworm-slim
+
+EXPOSE 2222
+
+ENV DEBIAN_FRONTEND=noninteractive
+
+COPY ca.pub /etc/ssh/trusted-ca.pub
+
+RUN apt -y update \
+    && apt -y install --no-install-recommends --no-install-suggests openssh-server \
+    && mkdir -p /run/sshd \
+    && adduser --disabled-password --gecos "" client_123 \
+    && passwd -d client_123 \
+    && rm -rf /var/lib/apt/lists/*
+
+COPY sshd_config /etc/ssh/sshd_config
+
+ENTRYPOINT ["/usr/sbin/sshd", "-D", "-e", "-f", "/etc/ssh/sshd_config"]
+
diff --git a/e2e/cahost/ca b/e2e/cahost/ca
new file mode 100644
index 00000000..1772609b
--- /dev/null
+++ b/e2e/cahost/ca
@@ -0,0 +1,7 @@
+-----BEGIN OPENSSH PRIVATE KEY-----
+b3BlbnNzaC1rZXktdjEAAAAABG5vbmUAAAAEbm9uZQAAAAAAAAABAAAAMwAAAAtzc2gtZW
+QyNTUxOQAAACCa8wnkN2vpvD5wPylJiviQHwtbTO0htoJBpltvZ149ZwAAAJCXKgKTlyoC
+kwAAAAtzc2gtZWQyNTUxOQAAACCa8wnkN2vpvD5wPylJiviQHwtbTO0htoJBpltvZ149Zw
+AAAEDt/vP5TaisrihzBV6UwHTFH4PwXtRz6MpWrbjmCciBgprzCeQ3a+m8PnA/KUmK+JAf
+C1tM7SG2gkGmW29nXj1nAAAAC3BnaWJzb25Ad3NsAQI=
+-----END OPENSSH PRIVATE KEY-----
diff --git a/e2e/cahost/ca.pub b/e2e/cahost/ca.pub
new file mode 100644
index 00000000..d513b2f8
--- /dev/null
+++ b/e2e/cahost/ca.pub
@@ -0,0 +1 @@
+ssh-ed25519 AAAAC3NzaC1lZDI1NTE5AAAAIJrzCeQ3a+m8PnA/KUmK+JAfC1tM7SG2gkGmW29nXj1n
diff --git a/e2e/cahost/sshd_config b/e2e/cahost/sshd_config
new file mode 100644
index 00000000..67a6b043
--- /dev/null
+++ b/e2e/cahost/sshd_config
@@ -0,0 +1,23 @@
+Port 2222
+
+# Trust our CA
+TrustedUserCAKeys /etc/ssh/trusted-ca.pub
+
+# Allow pubkey
+PubkeyAuthentication yes
+
+# Don't allow passwords
+PasswordAuthentication no
+# Don't allow host auth
+HostbasedAuthentication no
+# No challenge response
+ChallengeResponseAuthentication no
+
+# Allow client to pass locale environment variables
+AcceptEnv LANG LC_*
+
+# override default of no subsystems
+Subsystem       sftp    /usr/lib/openssh/sftp-server
+
+# Change this if you have issues
+LogLevel INFO
diff --git a/e2e/docker-compose.yml b/e2e/docker-compose.yml
index 40484eb1..98cae6f9 100644
--- a/e2e/docker-compose.yml
+++ b/e2e/docker-compose.yml
@@ -31,6 +31,17 @@ services:
     volumes:
       - shared:/shared      
       - sshconfig_publickey:/config
+
+  host-capublickey:
+    build: ./cahost
+    labels:
+      - sshpiper.port=2222
+      - sshpiper.network=e2e_default
+    volumes:
+      - shared:/shared
+    networks:
+      - default
+
     
   host-k8s-proxy:
     build: ./kubetools
@@ -89,6 +100,7 @@ services:
     depends_on:
       - host-publickey
       - host-password
+      - host-capublickey
       - host-k8s-proxy
 
   # ensure sshpiperd image works
diff --git a/e2e/e2eentry.sh b/e2e/e2eentry.sh
index e02280c1..5f1c7aa3 100755
--- a/e2e/e2eentry.sh
+++ b/e2e/e2eentry.sh
@@ -3,6 +3,11 @@
 # use entrypoint.sh to generate the ssh_host_ed25519_key
 PLUGIN="dummy_badname/" bash /sshpiperd/entrypoint.sh 2>/dev/null
 
+# Create an ssh key pair and then sign the public key with the ca cert
+chmod 600 cahost/ca
+ssh-keygen -t ssh-ed25519 -f /etc/ssh/ssh_user -N ""
+ssh-keygen -s cahost/ca -I ssh_user -n client_123 /etc/ssh/ssh_user.pub
+
 if [ "${SSHPIPERD_DEBUG}" == "1" ]; then
     echo "enter debug on hold mode"
     echo "run [docker exec -ti e2e_testrunner_1 bash] to run to attach"
diff --git a/libplugin/plugin.pb.go b/libplugin/plugin.pb.go
index ed160af7..01b5d0cb 100644
--- a/libplugin/plugin.pb.go
+++ b/libplugin/plugin.pb.go
@@ -379,7 +379,8 @@ type UpstreamPrivateKeyAuth struct {
 	sizeCache     protoimpl.SizeCache
 	unknownFields protoimpl.UnknownFields
 
-	PrivateKey []byte `protobuf:"bytes,1,opt,name=private_key,json=privateKey,proto3" json:"private_key,omitempty"`
+	PrivateKey  []byte `protobuf:"bytes,1,opt,name=private_key,json=privateKey,proto3" json:"private_key,omitempty"`
+	CaPublicKey []byte `protobuf:"bytes,2,opt,name=ca_public_key,json=caPublicKey,proto3" json:"ca_public_key,omitempty"`
 }
 
 func (x *UpstreamPrivateKeyAuth) Reset() {
@@ -421,6 +422,13 @@ func (x *UpstreamPrivateKeyAuth) GetPrivateKey() []byte {
 	return nil
 }
 
+func (x *UpstreamPrivateKeyAuth) GetCaPublicKey() []byte {
+	if x != nil {
+		return x.CaPublicKey
+	}
+	return nil
+}
+
 type UpstreamRemoteSignerAuth struct {
 	state         protoimpl.MessageState
 	sizeCache     protoimpl.SizeCache
@@ -1435,6 +1443,7 @@ type KeyboardInteractiveAuthMessage struct {
 	unknownFields protoimpl.UnknownFields
 
 	// Types that are assignable to Message:
+	//
 	//	*KeyboardInteractiveAuthMessage_PromptRequest
 	//	*KeyboardInteractiveAuthMessage_UserResponse
 	//	*KeyboardInteractiveAuthMessage_MetaRequest
@@ -2148,264 +2157,266 @@ var file_plugin_proto_rawDesc = []byte{
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 }
 
 var (
diff --git a/libplugin/plugin.proto b/libplugin/plugin.proto
index b0334509..2fc88c8b 100644
--- a/libplugin/plugin.proto
+++ b/libplugin/plugin.proto
@@ -35,6 +35,7 @@ message UpstreamPasswordAuth {
 
 message UpstreamPrivateKeyAuth {
   bytes private_key = 1;
+  bytes ca_public_key = 2;
 }
 
 message UpstreamRemoteSignerAuth{
diff --git a/libplugin/util.go b/libplugin/util.go
index 03f0797e..c66b5709 100644
--- a/libplugin/util.go
+++ b/libplugin/util.go
@@ -111,10 +111,15 @@ func CreatePasswordAuthFromString(password string) *Upstream_Password {
 	}
 }
 
-func CreatePrivateKeyAuth(key []byte) *Upstream_PrivateKey {
+func CreatePrivateKeyAuth(key []byte, optionalSignedCaPublicKey ...[]byte) *Upstream_PrivateKey {
+	var caPublicKey []byte
+	if len(optionalSignedCaPublicKey) > 0 {
+		caPublicKey = optionalSignedCaPublicKey[0]
+	}
 	return &Upstream_PrivateKey{
 		PrivateKey: &UpstreamPrivateKeyAuth{
-			PrivateKey: key,
+			PrivateKey:  key,
+			CaPublicKey: caPublicKey,
 		},
 	}
 }
diff --git a/plugin/testcaplugin/main.go b/plugin/testcaplugin/main.go
new file mode 100644
index 00000000..19c07bb9
--- /dev/null
+++ b/plugin/testcaplugin/main.go
@@ -0,0 +1,61 @@
+//go:build full || e2e
+
+package main
+
+import (
+	"fmt"
+	"os"
+
+	"github.com/tg123/sshpiper/libplugin"
+	"github.com/urfave/cli/v2"
+)
+
+func main() {
+	libplugin.CreateAndRunPluginTemplate(&libplugin.PluginTemplate{
+		Name:  "testcaplugin",
+		Usage: "Plugin to test ca public cert auth",
+		Flags: []cli.Flag{
+			&cli.StringFlag{
+				Name:     "target",
+				Usage:    "target ssh endpoint address",
+				EnvVars:  []string{"SSHPIPERD_FIXED_TARGET"},
+				Required: true,
+			},
+		},
+		CreateConfig: func(c *cli.Context) (*libplugin.SshPiperPluginConfig, error) {
+			target := c.String("target")
+
+			host, port, err := libplugin.SplitHostPortForSSH(target)
+			if err != nil {
+				return nil, err
+			}
+
+			return &libplugin.SshPiperPluginConfig{
+				PasswordCallback: func(conn libplugin.ConnMetadata, password []byte) (*libplugin.Upstream, error) {
+					if string(password) != "pass" {
+						return nil, fmt.Errorf("Password is incorrect")
+					}
+
+					// Load the private key
+					signer, err := os.ReadFile("/etc/ssh/ssh_user")
+					if err != nil {
+						return nil, fmt.Errorf("unable to read private key: %v", err)
+					}
+
+					// Load the public ca certificate
+					capublickey, err := os.ReadFile("/etc/ssh/ssh_user-cert.pub")
+					if err != nil {
+						return nil, fmt.Errorf("unable to read ca cert: %v", err)
+					}
+
+					return &libplugin.Upstream{
+						Host:          host,
+						Port:          int32(port),
+						IgnoreHostKey: true,
+						Auth:          libplugin.CreatePrivateKeyAuth(signer, capublickey),
+					}, nil
+				},
+			}, nil
+		},
+	})
+}